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Xanthium palustre

Comprehensive Description

provided by North American Flora
Xanthium palustre Greene, Pittonia 4: 63. 1899
Stem glabrous or slightly scabrous, sometimes reddish, often minutely purple-maculate lengthwise, probably 0.5-1 m. high; leaves 0.8-3 dm. long including the petioles; petioles equaling or exceeding the blades; blades ovate-cordate or deltoid, dentate, more or less lobed, scabrous; body of the fruit greenish-brown, finally thick-oblong and shining, glandular but scarcely pubescent, about 1.8 cm. long and 8-9 mm. thick; beaks short, thick, pubescent, incurved above, often somewhat hooked at the apex, 3-5 mm. long; prickles numerous but scarcely crowded, short, glandular and often sparingly pubescent toward the thick base, slender and glabrous above, hooked at the apex, 2-2.5 (rarely 3-3.5 or even up to 4) mm. long.
Type locality: Suisun Marsh, California.
Distribution: California.
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cc-by-nc-sa-3.0
bibliographic citation
Per Axel, Rydberg. 1922. CARDUALES; AMBROSIACEAE, CARDUACEAE. North American flora. vol 33(1). New York Botanical Garden, New York, NY
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